Transformer

Abstract

A transformer made of a multilayer construction in which plural spiral primary-side coils of thin plate and plural spiral secondary-side coils of thin plate are layered in turn. The primary-side coils of the multilayer construction are connected each other, the secondary-side coils of the multilayer construction are connected each other, an upper shielding layer of thin plate is disposed on the uppermost layer of the multilayer construction, and a lower shielding layer is disposed under the lowermost layer of the multilayer construction.

What is claimed is:  
     
         1 . A transformer comprising a multilayer construction composed of plural spiral primary-side coils of thin plate and plural spiral secondary-side coils of thin plate layered in turn, in which the primary-side coils are connected each other, the secondary-side coils are connected each other, an upper shielding layer of thin plate is disposed on an uppermost layer of the multilayer construction, and a lower shielding layer is disposed under a lowermost layer of the multilayer construction.  
     
     
         2 . The transformer as set forth in  claim 1 , wherein ferrite material is disposed on the upper shielding layer, the lower shielding layer, a peripheral side portion of the multilayer construction, and inner peripheral portions of the primary-side coils and the secondary-side coils of the multilayer construction.